LIBS Info: Element Analysis
| Title | Authors | Material | Detector | Spectrometer | Software |
|---|---|---|---|---|---|
| A partial least squares and wavelet-transform hybrid model to analyze carbon content in coal using laser-induced breakdown spectroscopy | Jianmin Liu, Weidou Ni, Zheng Li, Zhe Wang, Tingbi Yuan | Coal | Spectrolaser 4000 | Spectrolaser 4000 | Spectrolaser |
| Laser: | Nd:YAG 532.0000nm 120.0000mJ 1.000Hz |
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| Gate Delay: | 2.000us | ||||
| Gate Width: | 1000.000us | ||||
| The authors use wavelet denoising, then PLS (on the wavelet coefficients rather than the reconstructed spectra) to study Carbon content of coal samples. Samples were presented as pressed powder pellets. To find the best analysis conditions, analysis atmospheres containing air, argon and helium were tested. For example, the SNR from wavelet denoising doubled under Air and Ar, but tripled under He. Overall, Helium provided the best results. | |||||
| Element | Detection Limit (ppm) | Wavelength (nm) | Other Wavelengths (nm) | Calibration Method | Calibration Range (ppm) | Notes |
|---|
| Element | RMSE (ppm) | Wavelength (nm) | Calibration Method | Notes |
|---|---|---|---|---|
| C | 1.9400 % | -10.0000 | PLS | Wavelet denoising, then PLS in a He atmosphere |